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The Ionic Model
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The Ionic Model
Which of the following statements about ions and ionic compounds are true?
I. Nitrogen can form a 3- ion
II. Potassium can form a cation
III. The formula for aluminium chloride is AlCl2
I and II only
I and III only
II and III only
I, II and III
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What is the correct formula for ammonium carbonate?
NH3CO3
NH4CO3
(NH4)2CO3
(NH4)3CO3
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Which crystal structure does not conduct electricity when solid, has a high melting point and can conduct electricity when molten?
Giant metallic
Giant ionic
Macromolecular
Simple molecular
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Which of the following compounds is not bonded ionically?
CaCO3
CH3OH
NaOH
BaCl2
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Magnesium oxide has a very high melting temperature.
Which of the following is the best description of its structure and bonding?
Giant ionic
Giant metallic
Macromolecular
Simple molecular
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Which of the following compounds has both covalent and ionic bonds?
calcium bromide, CaBr2
potassium carbonate, K2CO3
propanoic acid, CH3CH2COOH
dichloromethane, CH2Cl2
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Which is the best description of ionic bonding?
electrostatic attraction between cations and electrons
electrostatic attraction between nuclei
electrostatic attraction between oppositely charged ions
electrostatic attraction of nuclei towards shared electrons in the bond between the nuclei
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Potassium bromide is an ionic compound.
When can potassium bromide conduct electricity?
| Solid | Molten | Aqueous |
A | ✓ | ✓ | ⨯ |
B | ✓ | ⨯ | ✓ |
C | ⨯ | ✓ | ✓ |
D | ⨯ | ⨯ | ✓ |
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Aluminium iodide, Al2I6 is a dimer and exists as a solid at room temperature. When it is a vapour it can exist as an AlI3 molecule.
How many valence electrons are in an aluminium iodide, AlI3, molecule?
22
24
26
28
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Which of the following substances has the highest melting point?
Mg
NaO
O2
C (graphite)
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What are the correct formulas for the following ions?
| Phosphate | Ammonium | Ethanoate | Nitrite |
A | PO43- | NH4+ | CH3COO+ | NO3- |
B | PO32- | NH4- | CH3COO- | NO2- |
C | PO43- | NH4+ | CH3COO- | NO2- |
D | PO42- | NH4+ | CH3CH2COO- | NO3- |
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Of the four compounds listed below which one has the greatest ionic character?
HCl
MgS
CO2
CaO
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What is the correct formula for aluminium sulfate?
Al3(SO4)2
Al(SO4)2
Al2(SO4)3
AlSO4
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